GLAST Burst Monitor

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GLAST Burst Monitor Charles Meegan
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GLAST Instruments

• Large Area Telescope
• Study AGNs, GRBs, pulsars
• Energy range 20 MeV to 1000 GeV
• Pair conversion telescope Si strip detectors
• Burst Monitor
• GRBs
• Energy Range 10 keV to 25 MeV
• Scintillation detectors

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Gamma-Ray Bursts

• Durations lt1 s to gt 100 s
• Energy primarily 10-1000 keV
• Rate of a few per day

• Most powerful events known
• Probably explosions of massive stars
• Often have optical X-ray afterglows

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GBM Science Rationale

• GBM extends the energy range of GRB observations.

• GBM provides real-time GRB localizations to allow
  repointing the spacecraft.

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GBM Collaboration
National Space Science Technology Center
University of Alabama in Huntsville
NASA Marshall Space Flight Center
Max-Planck-Institut für extraterrestrische Physik
Michael Briggs William Paciesas Robert
Preece Narayana Bhat Marc Kippen (LANL) Valerie
Connaughton (Science Support Center)
Charles Meegan (PI) Steve Elrod (PM) Alton
English (LSE) Gerald Fishman Chryssa
Kouveliotou Colleen Wilson-Hodge
Giselher Lichti (Co-PI) Andreas von
Keinlin Volker Schönfelder Roland Diehl Jochen
Greiner Helmut Steinle
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Detectors
Sodium Iodide (NaI) 12 detectors 5 diameter by
1/2 thick Cover low energy range Thin Be
window Determines burst directions
Bismuth Germanate (BGO) 2 detectors 5 diameter
by 5 thick Cover high energy range Two PMTs for
redundancy
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GBM Component Placement
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Energy Resolution Measurements
requirement
BGO
NaI
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Simulated LAT/GBM Joint Spectrum
Thanks to Nicola Omodei
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NaI Detector Spectrum
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BGO Detector Spectrum
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On-Board Trigger Threshold
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